A Russian baptismal cross locket pendant

A Russian baptismal cross locket pendant, of silver and gold, designed as a cross, one side with a design of Christ with a Bible, the other with the Orthodox cross, unscrewing at the base to open via a hinge, revealing an interior with reliefs of the Virgin Mary, and three angels gathered around a table, bordered with Cyrillic inscriptions, length 5.6cm, indistinct Russian marks